Hagstrom billed itself as "world's fastest neck." For a four string, I don't doubt it one bit from those I tried. It's too small for me. They had to go to an aircraft engineer for help because the necks were arriving broken or warped at importers.

Carvin is pretty doggone fast.

But when all is said and done, I'm with Tracy, the Atlansia Solitaire, as close as you can get to air bass -

LOL! How stupid am I! I thought the pic of the Atlansia Solitaire showed a bass in profile - ie. I thought that was the thickness of the bass, not the actual width!!! I went to the website and found out that it is a 1-string bass!